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Mermaid M3 – 3,500 BTU Marine Air Conditioner Reverse Cycle 120V
Mermaid M3 combines 3,500 BTU reverse-cycle air conditioning with 120V power for climate control in compact marine spaces.
- 3,500 BTU capacity suits small cabins.
- 120V input guides electrical installation.
- Reverse cycle enables heating operation.
- Cooling and heating use one unit.
- Compact capacity targets limited interiors.
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Description
Standard 110V shore power is still the most common setup on US boats, and the Mermaid M6 Cool & Reverse Cycle in 110V trim delivers 6,500 BTU of cooling and heating without asking for a voltage upgrade — sized for cruisers up to 27 feet or sailboats up to 30 feet, using the same compact platform found across Mermaid’s 110V lineup.
Key Features of the Mermaid M6 (110V, Reverse Cycle)
- Reverse cycle heating produces 10-15% more BTU output in heat mode than the cooling rating
- Compact 4″ ducting suits tight installation spaces common on smaller boats
- Soft start technology and variable speed blower reduce startup strain
- Available in right, left, or top air discharge configurations
- Resettable 30-amp circuit breaker simplifies field maintenance versus the older glass fuse design
Mermaid M6 Technical Specifications (110V, Reverse Cycle)
- Model: M6 (Cool & Reverse Cycle)
- Cooling Capacity: 6,500 BTU
- Voltage: 110V
- Running Amperage: 7.5 A
- Cooling Capacity (Volume): 550 cubic feet
- Recommended Boat Size: up to 27′ cruiser or 30′ sailboat
- Unit Dimensions (L x W x H): 16″ x 11.5″ x 11.5″
- Ducting: 4″, minimum two 4″ round supply grilles recommended
- Warranty: 5 years against material defects and workmanship
Why Choose the Mermaid M6 Reverse Cycle (110V)
This is the standard-voltage option for most domestic US boats, avoiding the added electrical complexity of stepping up to 220V or 230V circuits just for a smaller AC unit. Reverse cycle heating means the same unit covers both sides of climate control, which matters for boats used across shoulder seasons rather than pure summer cruising.
Boats without any real heating need might find the Cool Only 110V version of the M6 a simpler, slightly less complex alternative — fewer components generally means fewer things that can eventually require service.
What to Know Before Installing
- Pump is not included and must be purchased separately
- 4″ ducting requires at least two 4″ round supply grilles per Mermaid’s guidance
- The unit can run off a Honda EU1000i portable generator in cool mode, useful for boats without dedicated shore power
- Air discharge position must be selected at the time of order
| Brand | Mermaid Marine Air |
| Exact Model Code / SKU | M3 (120V Reverse Cycle Variant) |
| Country of Origin | USA |
| System Architecture | Self-Contained Marine A/C System |
| Cooling Capacity - BTU/h | 3,500 BTU/h |
| Cooling Capacity - kW/Watts | 1.03 kW |
| Heating Capacity - BTU/h | 4,000 BTU/h |
| Reverse Cycle Heating Function | Yes |
| Electrical Voltage | 120V |
| Alternating Current Frequency | 60 Hz |
| Electrical Phase | Single Phase |
| Full Load Amps - FLA Cooling | 3.2 A |
| Full Load Amps - FLA Heating | 3.9 A |
| Locked Rotor Amps - LRA | 14 A |
| Max Circuit Breaker Size | 15 A |
| Refrigerant Type | R-410A |
| Compressor Type | Hermetic Rotary |
| Seawater Water Flow Rate | 3.33 GPM (200 GPH) |
| Seawater Inlet Pipe Size | 5/8 inch (16 mm) |
| Seawater Outlet Pipe Size | 5/8 inch (16 mm) |
| Evaporator Airflow Capacity | 145 CFM |
| Duct Discharge Connection Diameter | 4 inches (102 mm) |
| Condensate Drain Connection Size | 1/2 inch (12.7 mm) |
| Physical Dimensions - Unit | 11.5 x 11.5 x 11.5 inches (292 x 292 x 292 mm) |
| Net Weight | 36 lbs (16.3 kg) |
| Chassis & Condenser Material | Stainless Steel Pan & Cupronickel Condenser Loop |
| Standard Factory Warranty | 5 Years |
| Application & Sizing Guidance | Micro climate configuration adding reliable reverse heating loops for tight crew quarters up to 120 cu.ft, min generator footprint 1.0 kW. |
What's in the Box
- 1x Mermaid M3 3,500 BTU Self-Contained Marine Air Conditioner Unit (120V - Reverse Cycle)
- 1x High-Performance Reverse Cycle Heating System
- 1x Compact Heavy-Duty Cupronickel Condenser Tube-in-Tube Heat Exchanger
- 1x Micro High-Velocity Centrifugal Blower Assembly
- 1x Marine-Grade Condensate Drain Pan Base Assembly
- 1x Mechanical/Digital Thermostat Interface Terminal Block
- 1x Removable and Washable Composite Air Filter
- 1x Operation Manual and Detailed Installation Guide
Mermaid M3 Reverse Cycle 120V FAQ
How much cooling does Mermaid M3 provide?
Mermaid M3 provides a total of 3,500 BTU cooling. This highly specialized, ultra-compact self-contained micro climate unit features full reverse-cycle heating capabilities, compressing eco-friendly refrigerant lines to supply stable interior temperatures during cold weather excursions or early morning spring fishing tournament launches.
What are the physical dimensions of M3?
Mermaid M3 features a footprint of 14.5x11.5x11.5 inches. These incredibly small chassis proportions grant installation engineers maximum layout flexibility, permitting a simple slide-in mount behind hanging locker bases or underneath localized cabin staircases where available vertical clearance is heavily restricted.
When is Mermaid M3 best applied?
Mermaid M3 is best applied on small cuddy cabins and pocket cruisers. This layout serves beautifully as a dedicated climate manager for small sailing vessels and dayboats from eighteen to twenty-four feet, running efficiently off small portable generators or heavy-duty inverter battery systems during remote overnight anchorages.
| Chassis Property | True Value |
|---|---|
| Net Weight | 42 lbs |
| Voltage Circuit | 120V 60Hz |
| Current Draw | 3.6 Amps |
| Duct Fitting | 4 inches |
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